Grinder.



C. D. MILLER.

GRINDER. APPLICATION 'mw MAR-16, was.

1,284,127 Patented NQV. 5, 1918..

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cant. i). ll/KILLER, or Kansas orrr, Mrssounr.

GRINDER.

To all whom it may concern:

Be it known that l, CARL D. MILLER, a citizen of the, United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented a new and useful Grinder, of which the following is aspecification. 1

The device forming the subject matter of this application is adapted tobe employed for grinding the valves of internalcombustion engines, andthe invention aims to provide novel means whereby an oscillatingmovement and a progressive rotary movement may be imparted to the valve,as the valve is rotated on its seat, to effect the grinding operation.

Another object of the invention is to provide novel means whereby achamber is formed for the reception of the mechanism which connects: themotor with the grinding shaft.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which. the presentinvention appertains.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preclseembodiment of the invention herein disclosed can be made within thescope of what is claimed without departing from the spirit of theinvention.

lln the accompanying drawings Figure 1 shows in longitudinal sectlon, avalve grinder constructed in accordance with the present invention, thesame being shown in operative relation to the valve to be ground, andparts being left in elevation,

Fig. 2 is a cross section taken approximately on the line 22 of Fig. 1;and

Fig. 3 is a fragmental elevation showing a portion of the grindingshaft.

lln carrying out the invention there is provided a casing 1 which may bemade of aluminum or any suitable material, the easing being of tubularform and including a reduced neck 2 in which is mounted a switch 3 ofany desired form, in circuit with a conductor 4:. The casing 1 issupplied with an internal shoulder 5 against which abuts a transverseplatform 6 carrying two posts 7 constituting a part of, or supporting anelectrical motor 8 supplied specification of Letters Batent.

Patented ne 5,1918

Application filed. March 16, 1918. Serial No. 222,910. a

with current from the conductor tandoori:

which is located a bearing bushing 12.

ring 11 is interposed between; the cap 10 and the platform 6 and isbound closely against the platform and the cap when the cap is threadedon the casing l, The c011 struction is such thata chamber 15 is fashioned within the ring 14: and between the platform 6 and the end of thecap 10, this chamber being fluidtight so asto receive a grease orlubricant in which sundry parts hereinafter described operate.

A grinding shaft l6is journaled for re: tation in the bushing 12 and isprovided with a bit 17 of any desired type, adapted to coact witha valve18, to rotate the valve on a seat 19 formed in a cylinder; 20, theobject in viewbeing to effect a grindingof the valve in a well-knownmanner, A stub;

shaft 21 isjournaled in the platformb and has a socket 22 of rectangularcross section, the socket receiving the armature. shaftf), the armatureshaft and the inner end of the stub shaft 21 being connected by a crosspin 23. The construction issuch that a secure driving connection betweenthe armature shaft 9 and the stub shaft 21 is afforded, the stub shaftalways being rotated when the arn'lature shaft is rotated.

The forward end of the stub shaft 21 may be pointed as shown at 2 1 andis received for rotation in a recess 25 formed in the butt end of thegrinding shaft 16. The stub shaft 21 passes through a washer 26 heldagainst the platform 6 by the rear end of the shaft 16, the washercarrying a packing 27 adapted to prevent the oil in the chamber 15 fromworking backwardly into the compartment which contains the motor 8. Apinion 28 is fashioned in the stub shaft 21. A disk 29 is rotatablymounted on the shaft 16 and is held in abtitment with the rear face ofthe end wall of the cap 10 by means of a flange 31 on the shaft 16, thedisk including a counterpoise 30. The disk 29 carries a stub shaft 32 onwhich is mounted a gear wheel 33 meshing into the pinion 28 andoperating in a slot 40,

fashioned in the side of theshaft 16 and I 35 pivoted on a stud 36constituting a part of an arm 37 carried by the grinding shaft 16.

An oscillating movement is imparted to the grinding shaft 16 andconsequently to the value 18 by a mechanism embodying the is rotated,as; aforesaid, the pivot elements 34 and 36 are moved off thestraight-line connecting the stub shaft 32 and the stub shaft 21,whereupon the leverage upon the shaft 16 becomes greater than theleverage upon the disk 29, the rotation of the latter ceasing, and thepinion 33 being rotated on the disk 29 to cause the oscillation of theshaft 16 and the valve 18 as above described.

Having thus described the invention, what 1 is claimed is L In a valvegrinder, a support; a grinding shaft ournaled therein and provided witha laterally extended arm; a disk mounted to rotate on the shaft andsupplied with a counter-Weight located in a common plane with the disk;a gear wheel journaled on the disk in eccentric position wlth respect tothe center of rotation on the disk; a driving pinion meshing into thegear wheel and supported for rotation independently of the disk; and alink having its ends pivoted, respectively, to the gear wheel and to thearm.

2. In a valve grinder, a casing having an internal shoulder; a removableplatform abutting against the shoulder and forming a rear compartment inthe casing; a cap mounted on the casing; a ring open at both ends anddisposed between the cap and the platform, and bound against theplatform by the cap, to hold theplatform on the shoulder, the cap, thering and the platform defining an oil compartment; a motor in the rearcompartment; means for connecting the motor with the platform, wherebythe motor and the platform may be removed together; and a shaftindependent of said means, the shaft passing throu h the platform; agrinding shaft j ournaled in the cap; and an operative connectionbetween the shafts, said connection being located in the oilcompartment.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

CARL D. MILLER.

Witnesses:

WARREN H. TURNER, L. D. ORMSBEE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, .D. 0.

